KDM — Section: 13.3 page 76

Unnecessary abstract classes for relationships in Action package. Action package defines 4 unnecessary asbstract relationships: CallableRelationship, MacroRelationship, ImportRelationship and DataRelationship. Originally they were introduced as potential extension hotspots, but later they were made abstract because of the overall KDM pattern and CMOF, so they are now completely redundant. Removing them will simplify KDM. This does not affect existing KDM XMI. Recommendation to promote CallableRelationship and DataRelationship to ActionRelationship and other two - to CodeRelationship (with the possibility for their from-endpoint to own them in order to achieve better encapsulation of the model).

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